supported by the National Natural Science Foundation of China(41402042,41002064,and 42172090);the Natural Sciences and Engineering Research Council of Canada(NSERC)Discovery Grant。
The Mesoproterozoic Bayan Obo Group located along the northern margin of the North China Craton(NMNCC)hosts a world’s largest known rare-earth element(REE)deposit(Bayan Obo Fe-REE-Nb deposit)[1,2]and a number of larg...